Rotary pump



J. AUGER. ROTARY PUMP. APPLICATION FILED FEB-7,1919- Patantefi Aug. 3, 1924 3 SHEETS-SHEET P.

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5115 fiffarrleys- J. T. AUGER.

ROTARY PUMP.v

APPLICATION FILED FEB. 7, 1919. 1,348,772. A Patented Aug. 3, 1920.

3 SHEETSSHEET 2.

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Jose v6 T Huger: 04 MW 611; .Ffforneys.

UNITED sTATEs PATENT OFFICE.

JOSEPH '1'. AUGER, or- MINNEAPOLIS, MINNESOTA, nssIeNon or THREE-EIGHTHS T E. M. FnnGUsoN, or sm-PAUL, MINNESOTA, AND THREE-EIGHTHS T0 E. DULAC,

or MINNEAPOLIS, MINNESOTA.

j ROTARY PUMP.

Application filed Februaryj, 19ie..- s rial No.- 275,543.

To all 'whom it may concern:

Be it known that I, Josnrrr I Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Rotary Pumps, ofwhich the following is a specification.- 5

My invention relates to rotary pumps and in particular to pumps of this type for use in connection with fire apparatus. -An object is to provide a pump which will have a high, degree of efficiency and at the same time will occupy only a comparatively small space.-

The full'objects and advantages of my invention'will appear in connection with the detailed description thereof and the novel features embodied in my inventive idea will be particularly pointed out in .the claims.

Referring to the. drawings,-

Figure 1 is a vertical section on the line 11 of 2. Fig. 2 is a horizontal section on the line 2-2 of Fig. 1. Fig. 3. is a horizontal section on the line 33 of Fig. 1. Fig. 4 is a' cross-section on the line 4-4 of Fig. 8. Fig. 5 is a detail view of the rotary pistons-Fig. 6 is a view similar to Fig. 4 showing a slight modification.

'The casing'fof the pump consists of three castings asio'llows: A base casting 10, an intermediate casting 12 and a casting 14. The castings .10 and 12 are secured together so as'-,.tfo form water-tight joints by bolts 16 .whiclfare located in holes in flanges 18 on the casting 12, and in holes in the top of the casting 10. The castings 12 and 14 are secured together so as'to form water-tight jointsby bolts 20 which are located in holes in flanges 22 on the casting 12, and in holes in the bottom of the casting 14. On account of this construction the castings may. be

. -'readily separated from each other to afford easy access to the interior parts. .The" ends of the base casting have tubular portions which constitute inlet openings 24 leading into an inlet chamber 26 The wall of one side of this chamber is provided, with a detachable closure 28 in order that accumulations of refuse material may be removed whenever desired. The bottom wallof the chamber is provided with 'a screw plug 30 which may be removed for draining the apparatus. The intermediate casting is so shaped as to have two partially-overlapping T. AUGE a citizen of'the United States, residing at.

admission ports 34 as shown in Fig. 4. As-

will be seen in Fig. 1, the piston chambers extend downwardly into the inlet chamber Speeifieaflonof Letters- Patent. Patented A11g23, 1920.

and the walls ofthe piston chambers at their lower line of intersection are provided with a ridge 36 which serves to divide the water which enters the two piston chambers.

A piston shaft 38 extends axially through each of the chambers 32 and these shafts may be driven in unison in the usual manner. The two shafts extend through stuffing boxes at both sides of the piston chamber, and outside of the stufiing boxes the shafts are provided with ball bearings 40. The stuffing boxes comprise an annular wall 42 within which are the following elements, which surround the shaft. A felt washer or other packing 44 is placed adjacent the wall of the piston chamber, and upon this packing is a metal washer 46. At the other end of the stufiing box is an annular nut 48 and a metal washer 50 which rests upon a felt washer or other packing 52, and the latter in turn rests upon a metal washer 54. The metal washers 46 and 54 are forced apart by a coiled spring 56 whereby. the felt, washers or packing 44 and 52 are compressed to make a water-tight joint. This construction provides a desirable packing for rotary pumps of this character where it is particularly desirable to provide water tight joints for the shafts of the rotary pistons. -By this construction also water is prevented from reaching the ball bearings 40. The rotary pistons now to be described are preferably provided with annular ribs 39 which engage the packing washers 44 in such manner as toincrease the tightness of the joint. Y a

Within the piston chambers the shafts 38 are provided with rotary pistons having a plurality of intermeshing piston blades 58. For convenience, and in order to better show the construction of the bridge, only one of the pistons is shown in Fig. 1. Fig. 5 shows in detail the particular construction and operation of the rotary pistons. Referring particularly to this figure each piston member consists of four piston blades 58 separated by cavities 60, the bottoms 62 of which are curved upon a large curvature and the side walls 64 of which are straight. Each of the side walls merges by reverse curves into the convex surfaces 66 of the side of the piston blade. The reverse curves form lugs 68 and-shallow depressions at 7 from which the water may readily escape when the piston blades. are in discharging position on account of the absence of steep engaging surfaces. The outer edges of the piston blades are provided withpacking strips 72,

76 in the bridge extends from one piston shaft to the ot er, while from the middle of this groove a vertical groove 78 extends to the bottom of the bridge 'so as to lead back to the. lower side of the'pi'ston chambers. The intermediate portion of each bridge has an upward extension 80 which is connected 'to the wall of the intermediate casting by a'narrow rib whereby pockets 84, best, shown bydotted; lines in Fig. 4, are

formed at the bottom of the lateral dis-- charge openings where they lead from the pistonchambers. On account of this construetio'n' a ready escape for grit and gravel from the pistonchambers is provided. The intermediate'casting, as will appear from 4, is bulged outwardly at both sides .to 'f rmthe lateral dischargeopenings 86. In-

providing the top casting. with the customary discharge chamber-to which the dischargeopenin'gs lead,- I have provided the following construction. The. top casting (so. ries the water-delivered by the pump. In

ethis manner a free and. unobstructed passage of water'is provided for directly from the pump to the hose. The upper curved surfacesof both piston chambers are extended at 90 beyond the place where'the lateral disand in operation the packing strlps on each, piston will in alternation come into cnga e-- embodies. two curved tubular members 88- extending in opposite -.-dire,ctions as best.

charge openings 86 begin. This adds to the force with which the piston blades deliver the-water out laterally through the openings 86. The walls. 90 are not extendedsufii- 'ciently to meet each other but a gap is left whereby an opening 92 is provided leading into a space in the top casting between the place where the tubular members or discharge pipes 88 lead from the discharge openings 86. Sufficient water to fill this 75. space will be forced up through the opening 92, and this water can escape at both sides into the discharge pipes 88. Above the opening 92 the top casting is provided with an air chamber 94 having an opening 96 in its bottom. Above the air chamber is a priming openin adapted to be closed by a screw plug 98. %ig. 6 shows a slight modification in which discharge pipes 100 head directly in a vertical direction from the lateral discharge openings 86, which are above the bridge walls 74. A receptacle 102 constitutes an air chamber and is secured to the top of the casing by a" screw-threaded coupling 104.

The operation and advantages of my ina ention will be readily understood from the foregoing description. On account of the discharge pipes leading directl from the lateral'discharge openings, the e cienc of the pump is increased, since the free discharge of water is not interfered with, while by extending the top surface of the piston cham-' bers beyond the place at which the piston blades begin to force water from the discharge openings, a greater impulse is- .im-

. parted to the water which is being discharged. The provision of the pockets 84 on each side of the narrow rib 82 gives ample opportunity for sand and gravel to be 9 struction of the piston blades causes the water to be forced out through the lateral dis charge openings with a free and easy movement, while the manner in which the packing on the piston blades engages the curved si1r-, face ofthe cavity ofthe coeperating piston member prevents leakage at this place. The

7 bridge members '74 may, if desired,- be provided'witli grooves 85 extendin in an inclined direct on downwardly an outwardly from the lower sides of the shafts 38 to the lower sides of the ends of the bridge members. This provides for the escape of sand and grit, while a water packing is formed by the pistons operating in connection with the grooves.

I claim: 1 x '1. A rotary pump comprisingv a casing containing two overlapping piston chambers provided with lateral intake and discharge openings, bridges separating said intake and 130 2. A rotary pump comprising a casing containing two overlapping piston chambers provided with lateral intake and discharge openings, bridges separating said intake and discharge openings, rotary pistons having intermeshing blades in said piston chambers, each of said bridges being provided intermediate its length with an upward extension, and a narrow rib connecting the vertical central portion of said extension with the outer wall of said discharge openings whereby pockets are formed at the bottom of said discharge openings.

3. A rotary pump comprising a casing containing twooverlapping piston chambers provided with lateral intake and discharge openings, bridges separating said intake and discharge openings, rotary pistons having intermeshing blades in said piston chambers, and shafts for said rotary pistons extendingthrough said piston chambers, said bridges being provided with grooves extending in an inclined direction downwardly and outwardly from the lower sides of said shafts to the lower sides of the ends of. said bridges. 4

4.. A rotary pump comprising a base member having an intake opening and a base chamber, a casing containing a pump chamber having curvedwa-lls joined together at the bottom and extending below the top of said base chamber, the said pump chamber being downwardly curved to conform to said walls, and lateral intake openings leading to the pump chamber. from said base chamber and extending to the bottom of said pump chamber, the latter being provided With a lateral outlet opening. a

5. A rotary pump comprising a casing containing a pump chamber having side walls connected by curved walls which are joined together at the bottom, a base member having an inlet opening and a base chamber, the latter surrounding the lower part of said'pump chamber, lateral intake openings leading to said pump chamber from the opposite sides of said base chamber, the said inlet openings being formed in said side walls and extending to the bottom of said pump chamber, the latter being provided with an outlet opening, and an air chamber above said outlet opening.

6. A rotary pump comprising a base member having horizontal inlet openings and a base chamber, said member having an opening in the top thereof, a casing containing a pump chamber having curved walls closing said opening at the top of said base chamber, the lower portion of said curved walls extending through said opening so as to be submerged in the liquid-in said base chamber and said base chamber surrounding the submerged portion of said pump chamber, lateral intake openings leading from said base chamber to said pump chamber and extending to the bottom of said pump chainber, the. latter being provided with outlet openings.

In testimony whereof I hereunto aflix my signature.

JOSEPH T. AUGER. 

